Headlight.



0. WINSTON.

HEADLIGHT,

APPLICATION HLED MAY1,1916.

1,2899926. Patented 00t.8,1918.

35 Fig. 1, but showing in Figs. 1 yand 2, the numeral 1 indicates 50 v erably to lbe noted, but fully described and 55 1 f radially projecting lugs 6 adapted Ato be inv To all whom t may concern.'

N. IUNITED. STATES PATEN orrrcn.

.OVERTON WIN STON, OF MINNEAPOLIS, MINNESOTA.

EADLIGHT.

Be it known that I, OVERTON WINs'roN, a citizen of the United States, residing at Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Headlights; and I do hereby declare the following to be a full, clear, and exact description of the invention, such-as will enable others skilled in the art to which it appertains to make and use the same.`

' My present invention relates to headlights, such as used in automobiles, and has for its object to provide certain improvements in the lamp socket thereof. Particularly, the

invention is in the nature of an, improvelightsment on or modification of the lamp socket construction disclosed and claimed in m pending` :application S. N. 86,851 iiled of date,-March 27th, 1916, andV entitled Head- In the accompanying drawings which illustrate the invention, like characters indicate the like parts throughout the several views.

lReferring to the drawings:

Figure 1 is a vertical section taken through the improved socket showing an electric light bulb held thereby;

FFig. 2 is a section on the line m2- :vz of ig.y 1; Fig. 3 is a view coresponding to Fig. 1, but illustrating a slightly modified construction; and

Fig. 4- is another view' corespondino to a socket designed or a three-contact lamp orlight bulb.

Figs. 1, 2 andB` show the socket designed for ka-two contact lamp or light bulb. Referring first tothe construction illustrated diagrammatically an electric light bulb preferably of well known Ediswan single-base type, but, of course, other types may be employed. As shown, this bulb has a hood contact sleeve 2 and an axial contact disk 3. The sleeve 2 is adapted tobe telescoped into a holdingcollar 4 that is provided with an externally threaded eccentric portion 5 that performs a highly important function prefclaimed in my said application above identied.M Y

vThe metallic collar 2.of the bulb is provideduwith a plurality, as shown, with two Specicaton of Letters Patent.

ladapted to be engaged. The

Application led May 1, 1916. Serial No. 94,617.

serted through a corresponding pair of internal longitudinal grooves 7 formed in the collar 4:. At the inner extremities of the grooves 7, the collar 4c is provided with an internal shoulder formed with corrugations or serrations 8 with which the lugs 6 are said grooves 7 and corrugated shoulder 8 are more fully described in my said prior application, and are indicated by dotted lines in- Fig. 1. The eccentric externally threaded portion 5 of the holding collar 4 is screwed into the internal threads 9a of a socket sleeve 9, in the rear end of which is secured an insulating plug 10. The insulating plug 10 has a forwardly spring-pressed axially projecting contactl plunger 11, the head of which engages the axial contact 3 of the light bulb, when the latter is in position. The so-called holding collar 4 and sleeve 9 constitute an adjustable lamp socket, and by rotary adjustment of the said collar and its threaded eccentric, the light bulb may be adjusted, both longitudinally and transversely of the axis of the socket, and hence, of the reflector, not shown, but which will usually be empyed in headlights where the socket is app ie To prevent rattling, and to frictionally hold the eccentric collar in its different set adjustments, a coiled spring 12 is placed within the sleeve 9 and is compressed between the insulating block 10 and the inner end of the eccentric end portion of the holding collar. The spring 12 is thus brought into close association with the internal threads 9a of the sleeve 9, and, in practice, will frequently be in contact therewith. In practice, I have found that where threads 9a and a spring 12have the same spiral thread, that is, for example, when both have a right hand travel, the said spring will frequently catch in the said threads and will interlock and thus interfere with proper adjustments of the holding collar; but I have also found that by giving the said threads and spring reverse spiral travel, that is, for example, by making the one right hand and the other left hand, this interlocking will be positively prevented. This reverse arrangement of the threads and spring is clearly shown in Fig. 1. To prevent the front end of the spring 12 from catching in the threads 9, it is bent or turned inward at 12a (see Fig. 2).

In the single-base lamp or light bulb shown in Fig. 1, the contact plunger 11 is connected to oneof the lamp circuit leads 13,

and through the same and contact disk 3, to

one of the electrodes of the lamp filament, not shown. The other electrode of the lamp by overcompression of the spring.

The construction illustrated in Fig'. 31s like that illustrated vin Fig. 1, exceptthat the insulating plug-10a has a reduced .fore Wardly proj ecting' portion .10b aroundwhich the rear end of the. spring 12 is telescoped. rlhis reduced portion v10b permits theV` use .of a longer spring than that employed .in the construction illustrated in Fig. 1. yAs al-' ,April 14,4916, and entitled ready stated, the sockets shown in. Figs. 41 and 3) are @especially designedfor single-base light bulbs. Preferably, both of these sock. ets would be mounted' for pivotal adjustments, and this may be done by the ,construction illustratedin my said pricrapplication. y ,f

The socket shown in Fig. 4t is especially designed for a double baselight bulb, such, for example, as that illustrated in my pending application S. N. 91,226, filed of date, Headlights A lamp of this kind has three electrical contacts 15, 16 and 17 The contact e15is in the form of a metallic sleeve which surrounds the shank ofthelamp, the contact 16 is in the form of a metal ring applied to the end of` the shank, and the Contact 17is in the form of a'sinall disklocated at the axis of the shank. rlhe said contacts 15, 16 and 17 are insulated from each other by the insulating material ofi'rwhich' the'v shank "is made In this socket, the elements 4,55, 9, 10, 11 and'12 are identical iviththe-,parts identified by like numerals VVin-Fig. In this arrangement, however, av coiled `contact spring 18 yis compressedbetvveenthe insulating block 10 and the contact ring 16. This sprind 18 constitutes al part ofV one of the v ci electrical connections, and it is electrically connected to one of the lamp leads 19. 'The said spring 18 must, of course, 'be held out of contact With the spring 12, and also out of contact With the contact plunger V11Y and its spring. |This is done` by means of an insulating ring 20, the, outer surface'of Which is tapered and driven-into the cavity formed within the eccentric 5. AsY illustrated, the said ring 20 is held in the eccentric only by friction, but if desired it may be otherwise secured thereto. v

` Here-it should be noted that the cavity This prevents the elasticity of the spring from being destroyed Within the said eccentric is concentric to the axis of the shank of the light bulb and ytothe axis yo-f the Vcontact ring 16, but is eccentric to the axis of the contact plunger 11.

kUnder rotary adjustments of the collar 4 is so extended thatit Willalways .Illantain` its ,y engagement .with the contact disk 17., regardless n ,ofv the shifting .movementsd o f the latter, in respect-thereto. `The insulatingA ring v,2.0 is internally taperedandfithe front end portion,- ofztliecontact spring 18 yis also slightly tapered so that Whenjthe lamp-'is removed said insulating. ring `Wil-l serve as a stop toprevent theSpring jectedoutat: the fS0Oket- A Socket vSuch .22S-y shovvn in Fig. Lfvvillnot usuallybejpivotally mounted, because with. a two-filament lamp, the variable projection ,of the liglitfbeams is @produced bydirecting `the current through one orltheother of the ltvv'o lamentsof the t lamp. ,Y

What Iclaim is: Y 1 .i ',1. A lamp socket having internallyan'd externally threaded engaging membersand a -spring Within member closely associated With the threads sro from being pIOfA Zthe. 'internally` tl'ireadedy s thereof and'pressing against .the externally threaded member, the said internal threads and spring having .reverse travely to.prevent interlocking thereof. 1 i

2. In a lamp:socket,;.the combination vvith an `internally-threaded sleeve` having an insulating block in `one end,.ofa lamp holding collar having anexternally.threadedecA centric engagingtheiinternal threads of'said 1 sleeve, and spring Within said` sleeve closely associated, with :the threads lther'eof,

and compressed between said insulating block vand externally threaded eccentric,

said spring-andthe internal threads ofafsaid sleeve .having reverse travel.

3. A lain socket having =i ternallyjand externally -t readed engaging members and a spring' Withinthe "internally ithreaded member lclosely associatedvvith the threads thereof Vand lpressing against the externally threaded member, the saidfinternallthreads and spring having reverse .travel to prevent interlocking thereof, the end fof said spring being inwardly curved to prevent ther same from catching in the saidfinternalthreads.

4c; VIn a lamp socket, the combination with aninternally-threaded sleeve having an inl sulatingblock in'one end, of a lamp holding collar having an `external-1y threaded :ec-.

centric engaging the' internalthreads of said sleeve, anda spring Within said sleeve closely associated with the threads thereof, and compressed betweenV l said-insulating block and externally threaded eccentric, said f spring andthe internal threads lofsa'd sleeve having reverse thread or travel, the eccentric engaging end of said spring being inwardly curved to prevent the same from catching in said internal threads.

5. The combination with a socket sleeve having an insulating block in one end, and having internal threads in its other end, of a lamp holding collar having an externally threaded eccentric engaging the internal threads of said sleeve, an aXial` springpressed contact plunger projecting from said insulating block, an insulating ring inserted into said threaded eccentric, and a contact spring seated at its rear end against Copies of this patent may be obtained for five cents each, by addressing the said insulating block, and at its forward 15 compressed between said insulating block 20 and the inner portion of said eccentric.

In testimony whereof I afiix my slgnature in presence of two witnesses.

OVERTON WINSTON.

Witnesses:

HARRY D. KILGORE, EVA E. KNIG.

Commissioner of Patents,

Washington, D. C. 

